Indiana Code Title 34. Civil Law and Procedure § 34-51-4-5

(1) within nine (9) months after a claim is filed in the court, or any longer period determined by the court to be necessary upon a showing of good cause, one (1) or more of the parties against whom the claim is filed makes a written offer of settlement to the party receiving a judgment;

(2) the terms of the offer include payment within sixty (60) days after the offer is accepted; and

(3) the amount of the offer is at least two-thirds ( 2/3 ) of the amount of the judgment award.